Shawn McCarney | 83169bf | 2020-02-24 15:59:34 -0600 | [diff] [blame] | 1 | /** |
| 2 | * Copyright © 2020 IBM Corporation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "i2c_write_bytes_action.hpp" |
| 18 | |
| 19 | #include "action_error.hpp" |
| 20 | #include "i2c_interface.hpp" |
| 21 | |
| 22 | #include <exception> |
| 23 | #include <ios> |
| 24 | #include <sstream> |
| 25 | |
| 26 | namespace phosphor::power::regulators |
| 27 | { |
| 28 | |
| 29 | bool I2CWriteBytesAction::execute(ActionEnvironment& environment) |
| 30 | { |
| 31 | try |
| 32 | { |
| 33 | i2c::I2CInterface& interface = getI2CInterface(environment); |
| 34 | uint8_t valuesToWrite[UINT8_MAX]; |
| 35 | if (masks.size() == 0) |
| 36 | { |
| 37 | for (unsigned int i = 0; i < values.size(); ++i) |
| 38 | { |
| 39 | valuesToWrite[i] = values[i]; |
| 40 | } |
| 41 | } |
| 42 | else |
| 43 | { |
| 44 | // Read current device register values. Use I2C mode where the |
| 45 | // number of bytes to read is explicitly specified. |
| 46 | uint8_t size = values.size(); |
| 47 | uint8_t currentValues[UINT8_MAX]; |
| 48 | interface.read(reg, size, currentValues, |
| 49 | i2c::I2CInterface::Mode::I2C); |
| 50 | |
| 51 | // Combine values to write with current values |
| 52 | for (unsigned int i = 0; i < values.size(); ++i) |
| 53 | { |
| 54 | valuesToWrite[i] = |
| 55 | (values[i] & masks[i]) | (currentValues[i] & (~masks[i])); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | // Write values to device register |
| 60 | interface.write(reg, values.size(), valuesToWrite, |
| 61 | i2c::I2CInterface::Mode::I2C); |
| 62 | } |
| 63 | catch (const i2c::I2CException& e) |
| 64 | { |
| 65 | // Nest I2CException within an ActionError so caller will have both the |
| 66 | // low level I2C error information and the action information |
| 67 | std::throw_with_nested(ActionError(*this)); |
| 68 | } |
| 69 | return true; |
| 70 | } |
| 71 | |
| 72 | std::string I2CWriteBytesAction::toString() const |
| 73 | { |
| 74 | std::ostringstream ss; |
| 75 | ss << "i2c_write_bytes: { register: 0x" << std::hex << std::uppercase |
| 76 | << static_cast<uint16_t>(reg) << ", values: [ "; |
| 77 | for (unsigned int i = 0; i < values.size(); ++i) |
| 78 | { |
| 79 | ss << ((i > 0) ? ", " : "") << "0x" << static_cast<uint16_t>(values[i]); |
| 80 | } |
| 81 | ss << " ], masks: [ "; |
| 82 | for (unsigned int i = 0; i < masks.size(); ++i) |
| 83 | { |
| 84 | ss << ((i > 0) ? ", " : "") << "0x" << static_cast<uint16_t>(masks[i]); |
| 85 | } |
| 86 | ss << " ] }"; |
| 87 | return ss.str(); |
| 88 | } |
| 89 | |
| 90 | } // namespace phosphor::power::regulators |